body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#1e1e1e;color:#fff;overflow:hidden}code{font-family:Consolas,Monaco,Courier New,monospace}#root{width:100vw;height:100vh;overflow:hidden}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden}.app{display:flex;height:100vh;width:100vw;background:#0a0a0a;overflow:hidden}.main-content{flex:1;display:flex;flex-direction:column;overflow:hidden}.editor-section{flex:1;display:flex;overflow:hidden}.mode-toggle{display:flex;gap:0;padding:0;background:#000;border-bottom:1px solid #1a1a1a}.mode-btn{flex:1;padding:16px 24px;background:#000;color:#888;border:none;border-bottom:2px solid transparent;font-size:14px;font-weight:500;cursor:pointer;transition:all .15s ease;text-transform:uppercase;letter-spacing:1px}.mode-btn:hover{background:#0a0a0a;color:#fff}.mode-btn.active{background:#000;color:red;border-bottom-color:red}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#0a0a0a}::-webkit-scrollbar-thumb{background:#333;border-radius:0}::-webkit-scrollbar-thumb:hover{background:red}::selection{background:red;color:#fff}button,input,textarea{transition:all .15s ease}@media(max-width:1024px){.app{flex-direction:column}.sidebar{width:100%;height:auto;max-height:40vh}}.sidebar{width:300px;height:100vh;background:#000;border-right:1px solid #1a1a1a;display:flex;flex-direction:column;overflow:hidden}.sidebar-header{padding:20px;background:#000;border-bottom:1px solid #1a1a1a}.sidebar-header h1{margin:0;font-size:18px;font-weight:400;color:#fff;text-transform:uppercase;letter-spacing:2px}.subtitle{margin:8px 0 0;font-size:11px;color:#888;font-weight:400;text-transform:uppercase;letter-spacing:1px}.lessons-container{flex:1;overflow-y:auto;padding:12px}.lessons-container::-webkit-scrollbar{width:6px}.lessons-container::-webkit-scrollbar-track{background:#000}.lessons-container::-webkit-scrollbar-thumb{background:#1a1a1a;border-radius:0}.lessons-container::-webkit-scrollbar-thumb:hover{background:red}.lesson-category{margin-bottom:24px}.category-title{font-size:11px;font-weight:700;color:#888;text-transform:uppercase;letter-spacing:1px;margin:0 0 12px;padding:8px 12px;background:#0a0a0a;border-left:2px solid #ff0000}.tasks-list{display:flex;flex-direction:column;gap:4px}.task-item{display:flex;align-items:flex-start;gap:12px;padding:12px;background:#000;border-radius:0;cursor:pointer;transition:all .15s ease;border:1px solid transparent}.task-item:hover{background:#0a0a0a;border-color:#1a1a1a}.task-item.active{background:#0a0a0a;border-color:red}.task-item.completed .task-icon{background:red;color:#000;border-color:red}.task-icon{width:24px;height:24px;border-radius:0;display:flex;align-items:center;justify-content:center;background:#1a1a1a;color:#888;font-weight:600;font-size:12px;flex-shrink:0;border:1px solid #1a1a1a;transition:all .15s ease}.task-content{flex:1;min-width:0}.task-title{font-size:14px;font-weight:400;color:#fff;margin-bottom:0}.task-description{font-size:11px;color:#666;line-height:1.4;margin-top:6px;padding-top:6px;border-top:1px solid #1a1a1a}.sidebar-footer{padding:16px 20px;background:#000;border-top:1px solid #1a1a1a}.progress-stats{display:flex;justify-content:space-between;font-size:11px;color:#888;font-weight:500;text-transform:uppercase;letter-spacing:1px}.progress-stats span:first-child{color:red}.code-editor{flex:1;display:flex;flex-direction:column;background:#1e1e1e;border-radius:0;overflow:hidden}.editor-header{display:flex;justify-content:space-between;align-items:center;background:#252526;border-bottom:1px solid #3e3e42;padding:0;height:50px}.editor-tabs{display:flex;align-items:center;height:100%}.editor-tab{display:flex;align-items:center;gap:8px;padding:0 20px;height:100%;background:transparent;color:#fff9;font-size:13px;font-weight:500;border-right:1px solid #3e3e42;cursor:pointer;transition:all .2s ease}.editor-tab.active{background:#1e1e1e;color:#fff;border-bottom:2px solid #00adb5}.editor-tab:hover:not(.active){background:#ffffff0d;color:#ffffffe6}.tab-icon{font-size:16px}.run-button{display:flex;align-items:center;gap:8px;margin-right:16px;padding:10px 24px;background:linear-gradient(135deg,#00d084,#00ff9d);color:#fff;border:none;border-radius:6px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s ease;box-shadow:0 4px 12px #00d0844d}.run-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 16px #00d08466}.run-button:active:not(:disabled){transform:translateY(0)}.run-button:disabled{opacity:.7;cursor:not-allowed}.run-button.running{background:linear-gradient(135deg,#00adb5,#00d4ff)}.play-icon{font-size:12px;display:flex;align-items:center}.spinner{width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.editor-wrapper{flex:1;position:relative;overflow:hidden}.monaco-editor .margin{background-color:#1e1e1e!important}.monaco-editor .line-numbers{color:#858585!important}.monaco-editor .current-line{border:none!important;background-color:#00adb51a!important}.monaco-editor .selected-text{background-color:#00adb54d!important}.monaco-editor .squiggly-error{background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 6 3'%3E%3Cpath d='M0 3L3 0L6 3' fill='none' stroke='%23ff3333' stroke-width='1'/%3E%3C/svg%3E") repeat-x bottom}.monaco-editor .squiggly-warning{background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 6 3'%3E%3Cpath d='M0 3L3 0L6 3' fill='none' stroke='%23ffcc00' stroke-width='1'/%3E%3C/svg%3E") repeat-x bottom}.error-line-highlight{background:#ff333326!important;border-left:3px solid #ff3333!important}.error-line-glyph{background:#f33!important;width:4px!important;margin-left:2px}.warning-line-highlight{background:#ffcc001f!important;border-left:3px solid #ffcc00!important}.warning-line-glyph{background:#fc0!important;width:4px!important;margin-left:2px}.console{height:280px;background:#0d1117;border-top:2px solid #30363d;display:flex;flex-direction:column}.console-header{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;background:#161b22;border-bottom:1px solid #30363d}.console-title{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:#fff}.console-icon{font-size:16px}.clear-button{display:flex;align-items:center;gap:6px;padding:6px 12px;background:#ffffff0d;color:#ffffffb3;border:1px solid rgba(255,255,255,.1);border-radius:4px;font-size:12px;cursor:pointer;transition:all .2s ease}.clear-button:hover{background:#ffffff1a;color:#fff;border-color:#fff3}.console-content{flex:1;overflow-y:auto;padding:12px;font-family:Consolas,Monaco,Courier New,monospace;font-size:13px;line-height:1.6}.console-content::-webkit-scrollbar{width:8px}.console-content::-webkit-scrollbar-track{background:#0003}.console-content::-webkit-scrollbar-thumb{background:#00adb580;border-radius:4px}.console-content::-webkit-scrollbar-thumb:hover{background:#00adb5cc}.console-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:#fff6;gap:12px}.empty-icon{font-size:48px;opacity:.5}.console-empty p{margin:0;font-size:14px}.console-output{display:flex;flex-direction:column;gap:2px}.console-line{display:flex;gap:12px;padding:4px 8px;border-radius:4px;transition:background .1s ease}.console-line:hover{background:#ffffff08}.line-number{color:#ffffff4d;font-size:11px;min-width:30px;text-align:right;-webkit-user-select:none;user-select:none}.line-content{flex:1;color:#c9d1d9;white-space:pre-wrap;word-break:break-word}.console-line.info .line-content{color:#58a6ff}.console-line.success .line-content{color:#3fb950}.console-line.error .line-content{color:#f85149;font-weight:500}.console-line.warning .line-content{color:#d29922}.console-line.output .line-content{color:#c9d1d9}.modal-overlay{position:fixed;inset:0;background:#000c;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-content{position:relative;background:linear-gradient(135deg,#1a1a2e,#16213e);border-radius:20px;padding:48px 60px;text-align:center;max-width:500px;box-shadow:0 20px 60px #00000080,0 0 0 2px #00adb54d;animation:slideIn .4s cubic-bezier(.68,-.55,.265,1.55);overflow:hidden}@keyframes slideIn{0%{transform:scale(.5) translateY(-100px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}.success-animation{margin-bottom:24px}.checkmark-circle{width:120px;height:120px;margin:0 auto;border-radius:50%;background:linear-gradient(135deg,#00d084,#00ff9d);display:flex;align-items:center;justify-content:center;box-shadow:0 10px 30px #00d08466;animation:scaleIn .5s cubic-bezier(.68,-.55,.265,1.55) .2s both}@keyframes scaleIn{0%{transform:scale(0)}to{transform:scale(1)}}.checkmark{font-size:64px;color:#fff;font-weight:700;animation:checkmarkPop .3s ease .5s both}@keyframes checkmarkPop{0%{transform:scale(0)}50%{transform:scale(1.2)}to{transform:scale(1)}}.success-title{font-size:32px;font-weight:700;color:#fff;margin:0 0 16px;animation:slideUp .4s ease .3s both}.success-message{font-size:16px;color:#fffc;margin:0 0 8px;animation:slideUp .4s ease .4s both}.task-name{font-size:18px;font-weight:600;color:#00ff9d;margin:8px 0 0;animation:slideUp .4s ease .5s both}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.confetti{position:absolute;top:50%;left:50%;width:1px;height:1px;pointer-events:none}.confetti-piece{position:absolute;width:10px;height:10px;border-radius:2px;animation:confettiFall 2s ease-out var(--delay) both;transform-origin:center}@keyframes confettiFall{0%{transform:translate(0) rotate(0);opacity:1}to{transform:translate(var(--x),var(--y)) rotate(var(--rotation));opacity:0}}.quiz-question-container{padding:40px;max-width:900px;margin:0 auto}.quiz-header{display:flex;gap:12px;margin-bottom:30px;flex-wrap:wrap}.quiz-category{background:red;color:#000;padding:4px 12px;border-radius:0;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1px}.quiz-difficulty{background:#1a1a1a;color:#888;padding:4px 12px;border-radius:0;font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:1px}.quiz-multi-badge{background:#000;color:#fff;padding:4px 12px;border:1px solid #333;border-radius:0;font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:1px}.quiz-question-text{font-size:22px;color:#fff;margin-bottom:30px;font-weight:400;line-height:1.5}.quiz-code{background:#000;border:1px solid #1a1a1a;border-radius:0;padding:24px;margin:30px 0;font-family:Consolas,Monaco,monospace;font-size:13px;line-height:1.6;color:#ccc;overflow-x:auto}.quiz-code code{color:#fff}.quiz-options{display:flex;flex-direction:column;gap:8px;margin:30px 0}.quiz-option{display:flex;align-items:center;gap:16px;padding:16px 20px;background:#000;border:1px solid #1a1a1a;border-radius:0;cursor:pointer;transition:all .15s ease;font-size:15px;color:#fff;text-align:left}.quiz-option:hover:not(:disabled){background:#0a0a0a;border-color:#333}.quiz-option:disabled{cursor:not-allowed}.quiz-option.correct{background:#000;border-color:#0f0;color:#fff}.quiz-option.incorrect{background:#000;border-color:red;color:#fff}.quiz-option.selected{background:#0a0a0a;border-color:red}.option-letter{display:flex;align-items:center;justify-content:center;width:32px;height:32px;background:#1a1a1a;border-radius:0;font-weight:600;font-size:13px;flex-shrink:0;color:#888}.quiz-option.correct .option-letter{background:#0f0;color:#000}.quiz-option.incorrect .option-letter{background:red;color:#000}.option-text{flex:1;font-weight:400}.checkbox{font-size:20px;margin-right:8px;color:red}.checkmark,.crossmark{font-size:18px;font-weight:700;margin-left:auto;color:#888}.quiz-option.correct .checkmark{color:#0f0}.quiz-option.incorrect .crossmark{color:red}.submit-multi-btn{background:red;color:#000;border:none;padding:14px 32px;border-radius:0;font-size:13px;font-weight:700;cursor:pointer;transition:all .15s ease;margin:20px auto;display:block;text-transform:uppercase;letter-spacing:1px}.submit-multi-btn:hover{background:#c00}.quiz-explanation{background:#000;border:1px solid #1a1a1a;border-radius:0;padding:24px;margin-top:30px}.quiz-explanation h3{margin:0 0 16px;font-size:16px;font-weight:600;text-transform:uppercase;letter-spacing:1px}.correct-title{color:#0f0}.incorrect-title{color:red}.quiz-explanation p{color:#ccc;line-height:1.6;margin:0 0 20px;font-size:14px}.correct-info{color:#888!important;font-size:13px!important;margin-top:12px!important;font-style:normal}.next-btn{background:red;color:#000;border:none;padding:12px 28px;border-radius:0;font-size:13px;font-weight:700;cursor:pointer;transition:all .15s ease;text-transform:uppercase;letter-spacing:1px}.next-btn:hover{background:#c00}.quiz-stats{display:flex;justify-content:space-between;align-items:center;margin-top:24px;padding:12px 20px;background:#000;border:1px solid #1a1a1a;border-radius:0;color:#888;font-size:12px;font-weight:500;text-transform:uppercase;letter-spacing:1px}.quiz-stats p{margin:0}.quiz-results-container{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:40px 20px}.results-card{background:#000;border:1px solid #1a1a1a;border-radius:0;padding:60px;max-width:600px;width:100%;text-align:center}.results-header h1{font-size:32px;margin:0 0 12px;color:#fff;font-weight:400;text-transform:uppercase;letter-spacing:2px}.results-header p{font-size:14px;color:#888;margin:0 0 50px;text-transform:uppercase;letter-spacing:1px}.results-score{display:flex;justify-content:center;margin:40px 0}.score-circle{position:relative;width:200px;height:200px;border:2px solid #1a1a1a;border-radius:50%;display:flex;align-items:center;justify-content:center}.score-circle:before{content:"";position:absolute;inset:-2px;border-radius:50%;border:2px solid #ff0000;clip-path:polygon(50% 50%,50% 0%,100% 0%,100% 100%,0% 100%,0% 0%,50% 0%);transform:rotate(calc(var(--percentage, 0) * 3.6deg))}.score-text{text-align:center}.percentage{font-size:48px;font-weight:300;color:#fff;line-height:1}.fraction{font-size:16px;color:#888;margin-top:8px;text-transform:uppercase;letter-spacing:1px}.results-stats{display:flex;justify-content:space-around;margin:50px 0;padding:30px;background:#0a0a0a;border:1px solid #1a1a1a;border-radius:0}.stat-item{text-align:center}.stat-value{font-size:32px;font-weight:300;color:red;margin-bottom:8px}.stat-label{font-size:11px;color:#888;text-transform:uppercase;letter-spacing:1px}.results-actions{display:flex;gap:12px;margin-top:40px}.btn-restart,.btn-back{flex:1;padding:14px 28px;border:none;border-radius:0;font-size:13px;font-weight:700;cursor:pointer;transition:all .15s ease;text-transform:uppercase;letter-spacing:1px}.btn-restart{background:red;color:#000}.btn-restart:hover{background:#c00}.btn-back{background:#0a0a0a;color:#fff;border:1px solid #1a1a1a}.btn-back:hover{background:#000;border-color:#333}